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Make sure the tower is getting power. There will be a green light on the back of the tower where the power cord goes. Make sure the cord is snug and that it is securely plugged in to your power source - I'm hoping it is a power surge strip and in which case, make sure the surge strip didn't get unplugged or turned off. If you have it plugged directly in to the wall then make sure that outlet has power by plugging something else in to it that you know works. After doing all of this, make check to see if there is a light on the back of your pc. If not, unplug the power from the back of the tower, wait 30 seconds at least, and then plug it back in. Hit the power button on the front just once, if it doesn't power up, press and hold the button in for a 2 seconds and release. If that doesn't work, your power supply may have gone bad. That happens from time to time. Good luck, hope this helps!
Set all items up ready to be installed
Plug in your mouse and keyboard into the back of the tower. If u are using the old style connectors these have pins and will also be colour coordinated so you know where to plug into tower. They will have a notch inside so plug in carefully so not to break pins.
If they are USB connections they will be square at the end and u will see where these plug in at the back of the tower these do not have colour coordination as u can plug in anywhere.
Next your VGA cable, this is the cable that looks the same both ends with 15 pins in it. One end goes into your monitor and the other into the back of the tower these are shaped so they only fit in one way, again caution that you do not force in as you could bend the pins.
Next ensure u have the power leads into the tower and the monitor, these are the cables with a plug on one end and a female 3 hole socket at the other, u will see where these plug into both devices.
Next plug into wall ensuring socket is off first
Then switch on
Switch on your tower....monitor should come on by itself, if not hit the power button on your monitor
Perform a powerdrain of the computer i.e. unplug the power cable from the back of the tower and press the power button and hold it down for 10 secs.
Please make sure that the power cables are connected properly.
try using a different power cable and check it on a different wall outlet.
Best of Luck
You will have two plugs coming from your monitor
One will have a blue plug that looks a little different, the other one will have a regular plug which can be plugged into your power surge or into a wall outlet.
The blue one will match up with a port on your tower. If you look on the back of the tower where all of the plugs go you will see one that looks similar but is opposite to the one coming from the monitor. Make sure you turn it to fit then screw it in and you should be good to go
The Dell 725 printer power cord does NOT plug in to the tower. The Video Cable, on the other hand, plugs in to the tower's video output. Look for a connector like the one from the printer (often USB these days) to plug it in to the computer. There was a diagram that came with the computer that showed how to do all the connections, and the Power Cord does NOT plug in to the tower. USB connections are in various locations on your computer's tower, in the back and sometimes in the front too.
You may need to replace the cmos battery, its a cr2032 3v button cell Make sure all your expansion cards and memory are reseated. Make sure all cables are reseated. your power supply could be bad
If that doesn't work try this
Here is my fix for the dell dimension 4400 amber light problem. It works! replace cmos battery. then unplug power cord form wall about 5-10 secs. then plug it back in, wait 5 secs. If amber light comes on, press and hold power button until it goes out.
light out, press and hold power button while amber light comes on and
goes off again holding power button 2-3 secs after light goes out.)
repeat whats in parenthesis until computer turns on it should only take about 6, 7 tries.
After the computer boots, you may want to setup cmos or boot into windows. After you shutdown, unplug power cord for 5-10 secs then plug it back in. Press and hold the power button, computer should come on. I found that's the only way to turn on the computer. If you shutdown and don't unplug power cord the computer may not boot, mine didn't. Strange I'd say